\begin{pspicture}(0,-.5)(11,7)
	\input{fig/1d-helpers.tex}
  \multiput(0,0)(2,2){2}{
	  % Lassos.
	  \psframe*[linecolor=lightgray,fillcolor=lightgray](1.6,2.6)(7.4,4.4)
	  \pspolygon[linecolor=black,linestyle=dashed]
              (6.6,2.4)(6.6,1.6)(8.4,1.6)(8.4,3.4)(7.6,3.4)(7.6,2.4)
	  % Arrows and dots.
    \multiput(1,1)(2,0){3}{\Eright01\Hup10\Eleft21}
    \multiput(2,2)(2,0){3}{\Hright01\Eup10\Hleft21}
  }
  % Axes.
  \Taxis016\Xaxis1{10}0
\end{pspicture}
